Is it normal to miss a period for almost 2-3 months?

Selena
Girls I need some advice or some answers so I'm a regular on my period nd well i been late for a while now my last period was on nov 30-3  and well I took a pregnancy test like 3 days ago nd it came back negative nd I mean I get like cramps and like white discharge nd back pains but other then that I don't get any other symptom of pregnancy. So I'm kinda like confused idk what to do or think anymore. Has this happened to any of yu ladies taking a test and coming back negative? What are the chances of being pregnant? And not being pregnant? Cuz I really wanna know some of yur  experiences